I don't understand why you're resistant to using a good general-purpose file manager, especially as there are plenty of good free ones.
Meanwhile, it took days for the name "Piky Basket" to bubble up. Copywhiz, which is the new name for it, is the closest ready-made thing I can think of to what you want. Viz.:
Automatically organize files based on their properties
Copywhiz for Windows lets you automatically copy files to an organized folder structure.
Because most of them seem like they are orders of magnatude more complicated than what I'm looking for, and many of them don't seem to do what I'm asking at all. And none except one do it as simply as what I'm looking for.
I took a look at the copywhiz video. I counted 12-15 clicks to do what they demonstrated, plus or minus, not including the actual selecting of files. 'Enfolder' is 1 click. 2 if you count selecting 'enfolder' from the right click menu. And tbh, I don't really understand what it means to 'organize files by attribute' in the sense that it looks like copywhiz is just copying and pasting files. Maybe it's auto-sorting the desination folder by the attribute I'm selecting? I don't know but I've already lost interest because I'm not looking to sort, copy, move or do anything by attribute.
There was one suggested that looks simliar. But it was last updated in 2014. Probably fine, but... fresher is better. And anyway by the time that was suggested u/publicdomain had not only already started, but has been working for a few weeks. I'm not going to go to him and say 'hey- forget all that work you've already done, I found this other thing.' That doesn't seem right.
Here's a use case: I have a bunch of pictures of an item I want to sell on craigslist. Let's say 12 pics. The pics I took are large because photos are large these days. I select half a dozen that I want to post, and I resize them smaller. So now they're all in the same folder, originals and resized ones. But I want the resized ones separate because they're for posting only. So I select those resized ones, right click, and select 'enfolder'. Now they're all in their own folder and I name that folder 'resized'. Easy peasy. I don't want to copy them, I don't really even want to move them. I just want them in a folder.